There is an infinite amount if numbers in existence.
god (:
Infinity
Infanint impossible to tell
Numbers.
Closure of the set of numbers under subtraction or, equivalently, the existence of additive inverses.
Napolean the 1st invented the number system i believe.
D. Protons
Any number in existence, i.e. infinite amount of numbers
The creators of all the numbers needed to count beyond 49.
Irrational numbers were known in India around 7th Century BCE but there existence as a different class of number but they had not proved their existence. That is sometimes attributed to Hippasus, a Greek philosopher of the Pythagorean school in the 5th Century BCE.
The existence of an additive inverse.
Hippasus, However Pythagoras could not accept the existence of irrational numbers, because he believed that all numbers had perfect values. But he could not disprove Hippasus' "irrational numbers" and so Hippasus was thrown overboard and drowned.